Hello Thirdy,
Thanks for the reply and the further detail. This is an older support article. Just so I am clear, you have tried to download and install the link that I sent you, and that’s when you got the message?
Are you able to take a screen shot of the complete message to post? Depending on the message there may be actions we can take. Again as these drivers were released primarily for Big Sur, we’ve seen the best results with the most recent version 11.4. I do understand if upgrading the OS isn’t something you’d like to do.
Was this a recent purchase from Amazon? If it was you may want to return the adapter to Amazon. We do have other adapters that use Realtek Chipsets and drivers that are already built into macOS:
- https://plugable.com/products/usbc-te1000
- https://plugable.com/products/usb3-hub3me
- https://plugable.com/products/usbc-e2500
These adapters are more suited for Catalina 10.15.x. I hope this helps, and Iook forward to hearing back from you.
Thank you,
Kevin
Plugable Support